The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 DG DN A and the Leica APO 90mm f2 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 85mm F1.4 DG DN A is the longer of the two lenses at 94mm. The Leica APO 90mm f2 ASPH with a length of 78mm, is 16mm shorter. Besides being longer, the Sigma 85mm F1.4 DG DN A also has a larger diameter of 83mm compared to the Leica APO 90mm f2 ASPH's 64mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Leica APO 90mm f2 ASPH weighs 500g, 20% (130g) lighter than the Sigma 85mm F1.4 DG DN A's weight of 630g.
Filter Threads
The Sigma 85mm F1.4 DG DN A has a filter size of 77mm whereas the Leica APO 90mm f2 ASPH has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 85mm F1.4 DG DN A:
And these are the 55mm filters that we recommend for the Leica APO 90mm f2 ASPH:
Lens Mounts
The Sigma 85mm F1.4 DG DN A has the Leica L lens mount whereas the Leica APO 90mm f2 ASPH has the Leica M lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Focal Range
Sigma 85mm F1.4 DG DN A is a prime lens with fixed focal lenght of 85mm.
On the other hand, the Leica APO 90mm f2 ASPH is a prime lens with fixed focal lenght of 90mm.
